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W. A. LORENZ.

1 APBR BAG.

No. 596,373. Patented Dec. 28,1897.

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PAPER BAG.

No. 596,373. Patented Deo. 28,1897.

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NITED STATES 'Armar errori.

WILLIAM A. LORENZ, OF HARTFORD, CONNECTICUT, ASSIGNOR TO ALBERT vILVALKER, TRUSTEE, OF SAME PLACE.

PAPER BAG.

SPECIFICATION formingpart of Letters Patent No. 596,373, dated December 28, 1897.

Application nea June 19,1896.

To all whom t may concern,.-

Be it known that I, WILLIAM A. LORENZ, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Paper Bags, of which the following is a full, clear, and exact specication.

. This invention relates to improvements in the manufacture of square-bottomed paper bags of the general type shown and described blank into the well-known so-called diamond form, the end flaps of which, after being pasted, are folded over'toward each other down upon the side folds,which, together with the end iiaps, compose the bottom of the bag. Those portions of` the end flaps of the diamond immediately adjacent to their respective cross-fold lines are composed of two thicknesses of paper. As the manufacturing processes vof thesebags are at present conducted only the vuppermost ply of these flaps can receive any paste adjacent to the crossfolding lines, inasmuch as the outer wall of paper which forms the iiaps is partially cov- Serial No. 596,192. (No model.)

which form the outer plies of the hap-folds, thus leaving loose wings, as designated by 31 and 32 in Fig. 10. Therefore when these bags are used for enveloping granular or powdered substances these wings admit and secrete a considerable portion of the contents of the bag beneath the loose plies, making it diflicult to completely empty the paper bag of its contents, besides entirely losing the benefit of the strength of the Wings thus detached from the main wall. The object of this invention is to fasten these loose wings to the bag-bottom, so as to prevent any portion of -the contents of the bag from becoming lodged under them. This pasting of the loose wings serves to unify the plies of paper which compose the bottom-closing iiaps, and thereby make the bottoms of the bags stronger. My object is attained by providing the bottom folds, in addition to the usual paste fastenings, with apertures in the inner plies of the bottom-closing flaps through which the paste passes to secure the outer plies of those flaps to the side folds of the bottom in addition to the said fastenings.

Figure 1 o'f the drawings represents a side view, and Fig. 2 an end view, of a length of bellows-sided tubing such as is ordinarily employed in the manufacture of paper bags of the Deering and Stilwell types above alluded to, showing the cuts or perforations which are made in the tube in theprocess of manufacture for the accomplishment of the object of my present invention. Fig. 3 is a longitudinal section taken on the line 3 3 of Fig. 1. Fig. 4 is a side view of a blank severed from the tube of Fig. 1, exhibiting the same form of perforation that is made in the tube of the -latter figure, while Fig. 5 is a similar View of a blank of tubing, showing the perforations extending to the end of the blank. Fig. 6 represents the blank of Fig. 4 after it has been folded into the diamond form in any of the several ways well known in the art, While Fig. 7 represents the blank of Fig. 6 With lines of paste applied thereon. Fig. 8 represents the blank of Fig. 7 with one of its bottom flaps folded, while Fig. 9 shows that blank with both iiaps folded. Figs. 10, 11, 12, and 13 are enlarged perspective views showing the interior of the bottom of a paper IOO bag having bottom folds which as to their general form are similar to those of the bag shown in the Stilwell patent, No. 405,616, above referred to, the front walls being partially broken away, so as to show the appearance of the inner folds which compose the bottom. Fig. 14 is a view of a portion of a bag-blank, showing modified or supplemental applications of my improved means of fastening the loose wings of the bottom.

The numeral 1 in Figs. 1 and 2 indicates a length of bellows-sided tubing having an upper wall 2 and a lower wall 4 and having two bellows sides 5 and 6, extending inwardly from the edges of the tubing. This tubing is shown to be cnt squarely across at the lines 7 S, and the lines 9 10 and 11 12 indicate intervals at which the tubing may be severed in order to form blanks suitable for the manufacture of these bags. At that end of each of the blanks which is destined to become the bottom part of the bag, and adjacent to each of the severing-lines thereof, are located the perforations 13 14 in the upper wall 2, while similar perforations 15 16 are made in the lower wall 4, as shown in Fig. 3. The paper may be entirely cut away to form these perforations, but it is preferably punched or slitted, as shown at the left-hand end of the blank of Fig. 1, to form tongues 17, 1S, 19, and 20, which may be bent backwardly, as shown in Fig. 3, so that when the tubing is flattened ont those tongues will be doubled back under the principal plies, leaving the pcrforations open.

A blank 21, suitable for forming a squarebottomed bag, is shown in Fig. 4, the crossline 22 being that upon which the blank is subsequently folded to form the primary transverse fold characteristic of the formation of this type of bag-bottom. The perforations 13 and 14 and the corresponding backwardlybent tongues 17 and 18 are shown in the'upper wall of the blank, the lower wall of the blank having similar perforations 15 16 and backwardly-bent tongues 19 20. Vhen the blank is folded into the diamond form shown in Fig. 6, in any of the several ways well known in this art, the perforations 15, 16, 17, and 18 are brought into locations adjacent to and slightly beyond the flap-fold lines e e and f f and in position to coincide with the lines of paste 3,which are deposited upon the blank, as shown in Fig. 7, so that the paste passes through these perforations of the upper plies and upon the underlying outer wall of the tube which forms the outer ply of each of the flaps, which when folded over, as shown in Figs. 8 and 9, are secured to the side folds 33 34 by virtue of the paste which passes through the perforations, thus uniting with them to form the bottom of the bag. Then the bottom of the bag is thus completed by the folding of these iiaps, the perforations 15, 16, 17 and 1S and their tongues are entirely concealed from sight both from the inside and from the outside of the bag.

In Fig. 10 is shown an inside view of a bagbottom like that of the bag shown in the Stilwell patent, No. 405,616, having two loose wings 31 and 32, which are raised in the position they are liable to assume if left nnpasted, as in the ordinary methods of manufacture, showing by contrast with the corresponding pasted-down wings 33 and 34 on the opposite corners of that bag the objectionable features herein alluded to.

Fig. 11 represents an interior View of a bag which is similar to that of Fig. 10, excepting that it is made in accordance with the invention set forth herein. One of those wings 32 is raised up in this figure, so as to show its perforation 13, the tongue 17, and the spot of paste 3, which, passing through the perforation, is deposited upon the outer ply and serves to hold together the inner and outer plies of the bottom, which when pressed together retain the form and appearance shown in Fig. 12.

A modification of the form and location of the perforations is shown in Figs. 5 and 13, in which the perforatons 23, 24, 25, and 26 are formed by slitting the tube longitudinally at the indicated points immediately adjacent to the transverse lilies 9 10 and 11 12, on which the tube is severed to form the blanks. NVhen thus severed, the tongues 27, 2S, 2S), and 30 may be turned backwardly, as shown in Figs. 5 and 13, so as to leave apertures through which the paste may pass to the outer plies of paper, as already described. These perforations may be Varied in number, shape, and position to suit the requirements of bags having different forms of flaps or differentlydisposed paste-lines, so as to bring the perforations into coincidence with the lines of paste which are to be applied upon the blank in the regular process of manufacture, thus obviating the necessity of a special application of paste for this particular purpose.

In some forms or sizes of these paper bags it may happen that the location of the pastelines best suited for fastening the bottomclosing flaps does not coincide with the most desirable location for securing the above-described loose corner-wings. In such a case I provide additional perforations 131L 15, located, as shown, for example, in Fig. 14, where they will best effect their purpose, depositing extra lines or spots 3 3b of paste upon the side folds across the perforations, or at points which will coincide with the position of the perforations when the bottom-closing flaps are folded to their final positions. These eXtra lines or spots of paste may be deposited at the same time with the regular paste-lines employed for fastening the bottom flaps by suitably shaping the paste-depositing devices. By this method I am enabled to make the perforations while the tube is being drawn over the former without in any Way delaying or interfering with the present and usual operations of manufacturing the bag. Inasmuch as the perforations are located in the up- IOO IIO

substantially as shown and described inthe United States Patent to W. A. Lorenz and WV. H. I-Ioniss, No. 331,722, of December 1, 18.85. (See shaft 121 in Figs. 9, 15, and 16.)

The perforations should extend inwardly from the end of the blank far enough so that the paste can be applied along the perforations or cut-away portions without danger of extending beyond the edges of the side folds 35 and 36 of l(he diamond. These perforations shouldalso be located near the edges of the tubing, as shown in Fig. 1, so as to bring them close to the flap-fold lilies e e and ff, as shown in Fig. 7, in order that when the flaps are folded the wings 31, 32, 33, and 34 shall be secured to the outer wall at points close to the junction of the bottom with the vertical sides of the bag.

On account of the difficulty of removing and caring for the many small pieces of paper made by punching out the perforations l in the tube, I prefer to punch or slit the paper so as to form tongues which may be bent backward to form the apertures, as herein shown.

A bag made in accordance with this invention is possessed of two distinct advantages over those made by the processes lnow employed-iirst, in the fact that the bottom is much stronger on account of having all of its plies united bypaste, and, second, that they prevent waste of the material put into the bags, inasmuch as none of it is secreted in the bottom folds, but may all be emptied out.

I claim as my invention- 1. A paper bag of the class specified, provided with the usual paste fastenings, and having apertures in the inner plies of its bottom-closing aps through which the paste passes to secure the outer plies of those flaps to the side folds of the bottom in. addition to said fastenings.

2. A paper bag of the class specified having inside angular corner-wings, the outer plies of which are each provided with one or more perforations at their paste-lines, whereby both plies of the said wings are united with the bottom.

3. A paper bag of the class specified, provided with the usual paste fastenings, and having inside angular corner-wings, as 31, the inner plies of which are leach provided with one or more perforations located in substantial coincidence with those paste fastenings, whereby the paste thereof passes through to unite both plies to the bag-bottom.

WILLIAM A. LORENZ. lVitnesses: J ENNIE NELLIs, W. H. HoNIss. 

